Rotary electrical hand switch



A. H. MOLLIK ROTARY ELECTRICAL BAN SWITCH Filed In 16, mg

Patented Mar. 24, 1925.

UNITED STATES PATENT OFFICE.

ALWIN HUGO MOLLIK, OF FRANKFORT-ON-THE-VIAIN, GERMANY.

ROTARY ELECTRICAL HAND SWITCH.

Application filed May 16,

To all whom it may concern:

Be it known that I, ALWIN HUGO MoLLin, a citizen of the CzechoslovakianRepublic, and residing at Frankfort-on-the-Main, Germany, have inventedcertain. new and useful Improvements in Rotary Electrical Hand Switches,of which the following is a specification.

The present invention relates to rot electrical hand switches.

The object of the invention is an essential simplification in theconstruction of switches, which affords an almost unlimited life of theworking parts owing to the practical manner in which the switchingmembers are constructed.

An essential characteristic of the construction of the switch of thepresent invention is that contact springs which generally either breakor lose their resiliency by heating after a comparatively few switchingoperations and thereby make the apparatus useless, are dispensed with.

In order to understand the invention more clearly, reference is made tothe ae companying drawings, wherein:

-F.ig. 1 is a sectional view of the switch according to the invention,

Fig. 2 a top view of the base and 3 an interior view of the cover.

Figs. f to G are corresponding views of a modified form of the switchand Fig. 7 is a plane projection of the guidance line.

In Figs. 1 to 3, a is the switch base upon which the guide pins 1) andthe fixed contact pieces 0 are arranged.

The switch cover (Z contains the switch shaft 0 on which are arrangedthe contact bridge with the guide groove and the driver i movable in anaxial direction. also the spiral spring 71 and the'handle la.

The action of the switch can be easily understood by reference to saiddrawings. In the position of the individual parts shown in Fig. 1, thecontact bridge f is pressed against the contact pieces 0 under theaction of the spring h, and thus the circuit is closed. If the circuitis to be opened, the handle 76 is turned and with it the shaft ary 1922.Serial No. 561,505.

of the switch. Following the movement of the driver 2' the contactbridge first slides upon the surfaces of the contact pieces 0 until therotation of the guide groove 9 causes the pins 6 to snap from thenotches Z into the notches m. At this moment the contact surfaces of thebridge rest on the surface of the base. On the switch shaft being turnedstill further, the surfaces of the bridge slide over the base, arereleased as the inclined surfaces slide over the pins and again fallonto the contact surfaces when the pins snap into the notches Z.

The sliding of the contact bridge over the base has the purpose and theeffect of keeping the heat-tarnished parts of the contact surfacesbright.

Figs. 4: to 6 show a. modification of the rotary switch in which theguide pins instead of being mounted upon the base, are arranged withinthe contact bridge itself, and in which the guide groove arranged in thebase, the action being the same as in, the previously describedembodiment.

Fig. 7 shows a plane projection of the guidance line.

lVhat I claim and desire to secure b Letters Patent is A rotary switchdevice of the class described, including a base having acentral opening,a cover for the base, a spindle journaled in the cover and the openingin the base, combined binding and switch termiuals secured to said base,fixed pins carried by the base at each side of the opening, a metalliccontact bridge mounted on the spindle, a spring interposed between thecover and said contact bridge, for pressing the same toward the base,and an l.ll ..il2lf?(l cam member carried by the contact brid e andprovided with a guide-way having cam projections for engaging with thesaid pins on the base.

In testimony whereof I have atlixed my signature in presence of twowitnesses.

DR. ALIVIN HUGO MOLLIK.

Vitnesses 'Inos. H. ANDERSON, BASIL E. SAWARD.

